It’s only true is the car goes exactly 51.1 miles. Environmental Economics crunched the numbers. NPR agrees.

For a trip of 50 miles, the Volt gets 250 miles per gallon. But, for a trip of 200 miles, the Volt gets 62.5 mpg. Based on the EPA decision to rate the Volt at 230 mpg, they are assuming a trip of 51.11 miles.

Left unanswered: what is the EPA mppc (miles per pound of coal) for the Volt when running off the electric engine?

GM made a mistake by touting 230 mpg, a number they devised. Even EPA hasn’t agreed with it. I hope the Volt is a game changer, but GM has a long and tired history of doing innovative things on one hand, then screwing them up on the other. Plus, with a price starting at $40,000 and needing a minimum temperature between 32°F to 50°F to run on the battery alone,I wonder just how practical it is and how many will sell.